body{
  width: 900px;
  max-width: 90%;
  margin: 3% auto ;
  line-height:1.8;
  color:#444;
  font-family:"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Noto Sans","Noto Sans CJK SC","Microsoft YaHei",sans-serif;
}


ul,p{
  text-align: justify;
  font-size: 16px;
  color:gray;
  font-weight: 300;
  text-indent:2em;
}

h1,h2{
  margin-top: 5%;
  margin-bottom: 0%;

}

h4{
  margin: 0 auto ;
  text-align: center;
  font-weight: 300;
}

img{
  max-width: 900px;
  max-width: 90%;
}